I really liked the Dually Halter lessons. My horse had been rearing on me at times when I attempted to school him back (he was grumpy in the middle of our Canadian prarie winters and just wanted to be free in the indoor ring). This really shaked my confidence in the use of this halter, so I stopped because I didn't want to give him "issues". I didn't want to create a memory in him of resentment to this halter. But I have started using it again and he is responding well. I have the confidence after watching the Monty uni videos of horses rearing for him. I see this is a normal horse response now, but you have to be calm and safe.